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Elastoplastic nonlinear behavior of planar steel gabled frame

  • Moghaddam, Sina Heyrani (Department of Civil Engineering, Ferdowsi University of Mashhad) ;
  • Masoodi, Amir R. (Department of Civil Engineering, Ferdowsi University of Mashhad)
  • Received : 2019.03.08
  • Accepted : 2019.07.02
  • Published : 2019.10.25

Abstract

In this paper, static nonlinear analysis of gable frame is performed using OpenSees software. Both geometric and material nonlinearities are considered in analyses. To consider large displacements, co-rotational coordinate transformation is used in software. The effects of symmetric and asymmetric support conditions including clamped and simple supports are studied. On the other hand, the material nonlinearity is reflected on analyses using Giuffre-Menegotto-Pinto steel material. Note that strain hardening characteristics are also considered in this model. Moreover, I-shaped cross-section is assumed for all members. The results are provided for different geometry properties of gable frame including shallow and deep inclined roof. It should be added that buckling and post-buckling behaviors of gable frame are investigated using related equilibrium paths. A comparison study is also implemented on the responses of buckling loads obtained for different support and geometry conditions. To trace snap-through paths completely, a displacement control method entitled arc-length is utilized. Findings show the capability of proposed model in nonlinear analysis of gable frames.

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